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Tweak comments.

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This commit is contained in:
Attilio Rao 2010-01-07 01:19:01 +00:00
parent 21be55cc4b
commit c636ba831a
1 changed files with 18 additions and 0 deletions
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18
sys/kern/kern_lock.c
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@ -277,6 +277,11 @@ wakeupshlk(struct lock *lk, const char *file, int line)
* avoid a starvation for the threads sleeping on the shared
* queue by giving them precedence and cleaning up the
* exclusive waiters bit anyway.
* Please note that lk_exslpfail count may be lying about
* the real number of waiters with the LK_SLEEPFAIL flag on
* because they may be used in conjuction with interruptible
* sleeps so lk_exslpfail is consider as a 'upper limit'
* bound, considering the edge cases.
*/
realexslp = sleepq_sleepcnt(&lk->lock_object,
SQ_EXCLUSIVE_QUEUE);
@ -943,6 +948,12 @@ __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk,
* empty avoid a starvation for the threads sleeping
* on the shared queue by giving them precedence
* and cleaning up the exclusive waiters bit anyway.
* Please note that lk_exslpfail count may be lying
* about the real number of waiters with the
* LK_SLEEPFAIL flag on because they may be used in
* conjuction with interruptible sleeps so
* lk_exslpfail is consider as a 'upper limit' bound,
* considering the edge cases.
*/
MPASS((x & LK_EXCLUSIVE_SPINNERS) == 0);
realexslp = sleepq_sleepcnt(&lk->lock_object,
@ -1046,6 +1057,13 @@ __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk,
* threads sleeping on the shared queue by
* giving them precedence and cleaning up the
* exclusive waiters bit anyway.
* Please note that lk_exslpfail count may be
* lying about the real number of waiters with
* the LK_SLEEPFAIL flag on because they may
* be used in conjuction with interruptible
* sleeps so lk_exslpfail is consider as a
* 'upper limit' bound, considering the edge
* cases.
*/
if (v & LK_EXCLUSIVE_WAITERS) {
queue = SQ_EXCLUSIVE_QUEUE;